drivers/net/bonding/bond_sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/device.h>
  11 #include <linux/sched/signal.h>
  12 #include <linux/fs.h>
  13 #include <linux/types.h>
  14 #include <linux/string.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/inetdevice.h>
  17 #include <linux/in.h>
  18 #include <linux/sysfs.h>
  19 #include <linux/ctype.h>
  20 #include <linux/inet.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/etherdevice.h>
  23 #include <net/net_namespace.h>
  24 #include <net/netns/generic.h>
  25 #include <linux/nsproxy.h>
  26
  27 #include <net/bonding.h>
  28
  29 #define to_bond(cd)     ((struct bonding *)(netdev_priv(to_net_dev(cd))))
  30
  31 /* "show" function for the bond_masters attribute.
  32  * The class parameter is ignored.
  33  */
  34 static ssize_t bonding_show_bonds(const struct class *cls,
  35                                   const struct class_attribute *attr,
  36                                   char *buf)
  37 {
  38         const struct bond_net *bn =
  39                 container_of_const(attr, struct bond_net, class_attr_bonding_masters);
  40         struct bonding *bond;
  41         int res = 0;
  42
  43         rcu_read_lock();
  44
  45         list_for_each_entry_rcu(bond, &bn->dev_list, bond_list) {
  46                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
  47                         /* not enough space for another interface name */
  48                         if ((PAGE_SIZE - res) > 10)
  49                                 res = PAGE_SIZE - 10;
  50                         res += sysfs_emit_at(buf, res, "++more++ ");
  51                         break;
  52                 }
  53                 res += sysfs_emit_at(buf, res, "%s ", bond->dev->name);
  54         }
  55         if (res)
  56                 buf[res-1] = '\n'; /* eat the leftover space */
  57
  58         rcu_read_unlock();
  59         return res;
  60 }
  61
  62 static struct net_device *bond_get_by_name(const struct bond_net *bn, const char *ifname)
  63 {
  64         struct bonding *bond;
  65
  66         list_for_each_entry(bond, &bn->dev_list, bond_list) {
  67                 if (strncmp(bond->dev->name, ifname, IFNAMSIZ) == 0)
  68                         return bond->dev;
  69         }
  70         return NULL;
  71 }
  72
  73 /* "store" function for the bond_masters attribute.  This is what
  74  * creates and deletes entire bonds.
  75  *
  76  * The class parameter is ignored.
  77  */
  78 static ssize_t bonding_store_bonds(const struct class *cls,
  79                                    const struct class_attribute *attr,
  80                                    const char *buffer, size_t count)
  81 {
  82         const struct bond_net *bn =
  83                 container_of_const(attr, struct bond_net, class_attr_bonding_masters);
  84         char command[IFNAMSIZ + 1] = {0, };
  85         char *ifname;
  86         int rv, res = count;
  87
  88         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
  89         ifname = command + 1;
  90         if ((strlen(command) <= 1) ||
  91             !dev_valid_name(ifname))
  92                 goto err_no_cmd;
  93
  94         if (command[0] == '+') {
  95                 pr_info("%s is being created...\n", ifname);
  96                 rv = bond_create(bn->net, ifname);
  97                 if (rv) {
  98                         if (rv == -EEXIST)
  99                                 pr_info("%s already exists\n", ifname);
 100                         else
 101                                 pr_info("%s creation failed\n", ifname);
 102                         res = rv;
 103                 }
 104         } else if (command[0] == '-') {
 105                 struct net_device *bond_dev;
 106
 107                 rtnl_lock();
 108                 bond_dev = bond_get_by_name(bn, ifname);
 109                 if (bond_dev) {
 110                         pr_info("%s is being deleted...\n", ifname);
 111                         unregister_netdevice(bond_dev);
 112                 } else {
 113                         pr_err("unable to delete non-existent %s\n", ifname);
 114                         res = -ENODEV;
 115                 }
 116                 rtnl_unlock();
 117         } else
 118                 goto err_no_cmd;
 119
 120         /* Always return either count or an error.  If you return 0, you'll
 121          * get called forever, which is bad.
 122          */
 123         return res;
 124
 125 err_no_cmd:
 126         pr_err("no command found in bonding_masters - use +ifname or -ifname\n");
 127         return -EPERM;
 128 }
 129
 130 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
 131 static const struct class_attribute class_attr_bonding_masters = {
 132         .attr = {
 133                 .name = "bonding_masters",
 134                 .mode = 0644,
 135         },
 136         .show = bonding_show_bonds,
 137         .store = bonding_store_bonds,
 138 };
 139
 140 /* Generic "store" method for bonding sysfs option setting */
 141 static ssize_t bonding_sysfs_store_option(struct device *d,
 142                                           struct device_attribute *attr,
 143                                           const char *buffer, size_t count)
 144 {
 145         struct bonding *bond = to_bond(d);
 146         const struct bond_option *opt;
 147         char *buffer_clone;
 148         int ret;
 149
 150         opt = bond_opt_get_by_name(attr->attr.name);
 151         if (WARN_ON(!opt))
 152                 return -ENOENT;
 153         buffer_clone = kstrndup(buffer, count, GFP_KERNEL);
 154         if (!buffer_clone)
 155                 return -ENOMEM;
 156         ret = bond_opt_tryset_rtnl(bond, opt->id, buffer_clone);
 157         if (!ret)
 158                 ret = count;
 159         kfree(buffer_clone);
 160
 161         return ret;
 162 }
 163
 164 /* Show the slaves in the current bond. */
 165 static ssize_t bonding_show_slaves(struct device *d,
 166                                    struct device_attribute *attr, char *buf)
 167 {
 168         struct bonding *bond = to_bond(d);
 169         struct list_head *iter;
 170         struct slave *slave;
 171         int res = 0;
 172
 173         rcu_read_lock();
 174
 175         bond_for_each_slave_rcu(bond, slave, iter) {
 176                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
 177                         /* not enough space for another interface name */
 178                         if ((PAGE_SIZE - res) > 10)
 179                                 res = PAGE_SIZE - 10;
 180                         res += sysfs_emit_at(buf, res, "++more++ ");
 181                         break;
 182                 }
 183                 res += sysfs_emit_at(buf, res, "%s ", slave->dev->name);
 184         }
 185
 186         rcu_read_unlock();
 187
 188         if (res)
 189                 buf[res-1] = '\n'; /* eat the leftover space */
 190
 191         return res;
 192 }
 193 static DEVICE_ATTR(slaves, 0644, bonding_show_slaves,
 194                    bonding_sysfs_store_option);
 195
 196 /* Show the bonding mode. */
 197 static ssize_t bonding_show_mode(struct device *d,
 198                                  struct device_attribute *attr, char *buf)
 199 {
 200         struct bonding *bond = to_bond(d);
 201         const struct bond_opt_value *val;
 202
 203         val = bond_opt_get_val(BOND_OPT_MODE, BOND_MODE(bond));
 204
 205         return sysfs_emit(buf, "%s %d\n", val->string, BOND_MODE(bond));
 206 }
 207 static DEVICE_ATTR(mode, 0644, bonding_show_mode, bonding_sysfs_store_option);
 208
 209 /* Show the bonding transmit hash method. */
 210 static ssize_t bonding_show_xmit_hash(struct device *d,
 211                                       struct device_attribute *attr,
 212                                       char *buf)
 213 {
 214         struct bonding *bond = to_bond(d);
 215         const struct bond_opt_value *val;
 216
 217         val = bond_opt_get_val(BOND_OPT_XMIT_HASH, bond->params.xmit_policy);
 218
 219         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.xmit_policy);
 220 }
 221 static DEVICE_ATTR(xmit_hash_policy, 0644,
 222                    bonding_show_xmit_hash, bonding_sysfs_store_option);
 223
 224 /* Show arp_validate. */
 225 static ssize_t bonding_show_arp_validate(struct device *d,
 226                                          struct device_attribute *attr,
 227                                          char *buf)
 228 {
 229         struct bonding *bond = to_bond(d);
 230         const struct bond_opt_value *val;
 231
 232         val = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
 233                                bond->params.arp_validate);
 234
 235         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.arp_validate);
 236 }
 237 static DEVICE_ATTR(arp_validate, 0644, bonding_show_arp_validate,
 238                    bonding_sysfs_store_option);
 239
 240 /* Show arp_all_targets. */
 241 static ssize_t bonding_show_arp_all_targets(struct device *d,
 242                                          struct device_attribute *attr,
 243                                          char *buf)
 244 {
 245         struct bonding *bond = to_bond(d);
 246         const struct bond_opt_value *val;
 247
 248         val = bond_opt_get_val(BOND_OPT_ARP_ALL_TARGETS,
 249                                bond->params.arp_all_targets);
 250         return sysfs_emit(buf, "%s %d\n",
 251                        val->string, bond->params.arp_all_targets);
 252 }
 253 static DEVICE_ATTR(arp_all_targets, 0644,
 254                    bonding_show_arp_all_targets, bonding_sysfs_store_option);
 255
 256 /* Show fail_over_mac. */
 257 static ssize_t bonding_show_fail_over_mac(struct device *d,
 258                                           struct device_attribute *attr,
 259                                           char *buf)
 260 {
 261         struct bonding *bond = to_bond(d);
 262         const struct bond_opt_value *val;
 263
 264         val = bond_opt_get_val(BOND_OPT_FAIL_OVER_MAC,
 265                                bond->params.fail_over_mac);
 266
 267         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.fail_over_mac);
 268 }
 269 static DEVICE_ATTR(fail_over_mac, 0644,
 270                    bonding_show_fail_over_mac, bonding_sysfs_store_option);
 271
 272 /* Show the arp timer interval. */
 273 static ssize_t bonding_show_arp_interval(struct device *d,
 274                                          struct device_attribute *attr,
 275                                          char *buf)
 276 {
 277         struct bonding *bond = to_bond(d);
 278
 279         return sysfs_emit(buf, "%d\n", bond->params.arp_interval);
 280 }
 281 static DEVICE_ATTR(arp_interval, 0644,
 282                    bonding_show_arp_interval, bonding_sysfs_store_option);
 283
 284 /* Show the arp targets. */
 285 static ssize_t bonding_show_arp_targets(struct device *d,
 286                                         struct device_attribute *attr,
 287                                         char *buf)
 288 {
 289         struct bonding *bond = to_bond(d);
 290         int i, res = 0;
 291
 292         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
 293                 if (bond->params.arp_targets[i])
 294                         res += sysfs_emit_at(buf, res, "%pI4 ",
 295                                              &bond->params.arp_targets[i]);
 296         }
 297         if (res)
 298                 buf[res-1] = '\n'; /* eat the leftover space */
 299
 300         return res;
 301 }
 302 static DEVICE_ATTR(arp_ip_target, 0644,
 303                    bonding_show_arp_targets, bonding_sysfs_store_option);
 304
 305 /* Show the arp missed max. */
 306 static ssize_t bonding_show_missed_max(struct device *d,
 307                                        struct device_attribute *attr,
 308                                        char *buf)
 309 {
 310         struct bonding *bond = to_bond(d);
 311
 312         return sysfs_emit(buf, "%u\n", bond->params.missed_max);
 313 }
 314 static DEVICE_ATTR(arp_missed_max, 0644,
 315                    bonding_show_missed_max, bonding_sysfs_store_option);
 316
 317 /* Show the up and down delays. */
 318 static ssize_t bonding_show_downdelay(struct device *d,
 319                                       struct device_attribute *attr,
 320                                       char *buf)
 321 {
 322         struct bonding *bond = to_bond(d);
 323
 324         return sysfs_emit(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 325 }
 326 static DEVICE_ATTR(downdelay, 0644,
 327                    bonding_show_downdelay, bonding_sysfs_store_option);
 328
 329 static ssize_t bonding_show_updelay(struct device *d,
 330                                     struct device_attribute *attr,
 331                                     char *buf)
 332 {
 333         struct bonding *bond = to_bond(d);
 334
 335         return sysfs_emit(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 336
 337 }
 338 static DEVICE_ATTR(updelay, 0644,
 339                    bonding_show_updelay, bonding_sysfs_store_option);
 340
 341 static ssize_t bonding_show_peer_notif_delay(struct device *d,
 342                                              struct device_attribute *attr,
 343                                              char *buf)
 344 {
 345         struct bonding *bond = to_bond(d);
 346
 347         return sysfs_emit(buf, "%d\n",
 348                           bond->params.peer_notif_delay * bond->params.miimon);
 349 }
 350 static DEVICE_ATTR(peer_notif_delay, 0644,
 351                    bonding_show_peer_notif_delay, bonding_sysfs_store_option);
 352
 353 /* Show the LACP activity and interval. */
 354 static ssize_t bonding_show_lacp_active(struct device *d,
 355                                         struct device_attribute *attr,
 356                                         char *buf)
 357 {
 358         struct bonding *bond = to_bond(d);
 359         const struct bond_opt_value *val;
 360
 361         val = bond_opt_get_val(BOND_OPT_LACP_ACTIVE, bond->params.lacp_active);
 362
 363         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.lacp_active);
 364 }
 365 static DEVICE_ATTR(lacp_active, 0644,
 366                    bonding_show_lacp_active, bonding_sysfs_store_option);
 367
 368 static ssize_t bonding_show_lacp_rate(struct device *d,
 369                                       struct device_attribute *attr,
 370                                       char *buf)
 371 {
 372         struct bonding *bond = to_bond(d);
 373         const struct bond_opt_value *val;
 374
 375         val = bond_opt_get_val(BOND_OPT_LACP_RATE, bond->params.lacp_fast);
 376
 377         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.lacp_fast);
 378 }
 379 static DEVICE_ATTR(lacp_rate, 0644,
 380                    bonding_show_lacp_rate, bonding_sysfs_store_option);
 381
 382 static ssize_t bonding_show_min_links(struct device *d,
 383                                       struct device_attribute *attr,
 384                                       char *buf)
 385 {
 386         struct bonding *bond = to_bond(d);
 387
 388         return sysfs_emit(buf, "%u\n", bond->params.min_links);
 389 }
 390 static DEVICE_ATTR(min_links, 0644,
 391                    bonding_show_min_links, bonding_sysfs_store_option);
 392
 393 static ssize_t bonding_show_ad_select(struct device *d,
 394                                       struct device_attribute *attr,
 395                                       char *buf)
 396 {
 397         struct bonding *bond = to_bond(d);
 398         const struct bond_opt_value *val;
 399
 400         val = bond_opt_get_val(BOND_OPT_AD_SELECT, bond->params.ad_select);
 401
 402         return sysfs_emit(buf, "%s %d\n", val->string, bond->params.ad_select);
 403 }
 404 static DEVICE_ATTR(ad_select, 0644,
 405                    bonding_show_ad_select, bonding_sysfs_store_option);
 406
 407 /* Show the number of peer notifications to send after a failover event. */
 408 static ssize_t bonding_show_num_peer_notif(struct device *d,
 409                                            struct device_attribute *attr,
 410                                            char *buf)
 411 {
 412         struct bonding *bond = to_bond(d);
 413
 414         return sysfs_emit(buf, "%d\n", bond->params.num_peer_notif);
 415 }
 416 static DEVICE_ATTR(num_grat_arp, 0644,
 417                    bonding_show_num_peer_notif, bonding_sysfs_store_option);
 418 static DEVICE_ATTR(num_unsol_na, 0644,
 419                    bonding_show_num_peer_notif, bonding_sysfs_store_option);
 420
 421 /* Show the MII monitor interval. */
 422 static ssize_t bonding_show_miimon(struct device *d,
 423                                    struct device_attribute *attr,
 424                                    char *buf)
 425 {
 426         struct bonding *bond = to_bond(d);
 427
 428         return sysfs_emit(buf, "%d\n", bond->params.miimon);
 429 }
 430 static DEVICE_ATTR(miimon, 0644,
 431                    bonding_show_miimon, bonding_sysfs_store_option);
 432
 433 /* Show the primary slave. */
 434 static ssize_t bonding_show_primary(struct device *d,
 435                                     struct device_attribute *attr,
 436                                     char *buf)
 437 {
 438         struct bonding *bond = to_bond(d);
 439         struct slave *primary;
 440         int count = 0;
 441
 442         rcu_read_lock();
 443         primary = rcu_dereference(bond->primary_slave);
 444         if (primary)
 445                 count = sysfs_emit(buf, "%s\n", primary->dev->name);
 446         rcu_read_unlock();
 447
 448         return count;
 449 }
 450 static DEVICE_ATTR(primary, 0644,
 451                    bonding_show_primary, bonding_sysfs_store_option);
 452
 453 /* Show the primary_reselect flag. */
 454 static ssize_t bonding_show_primary_reselect(struct device *d,
 455                                              struct device_attribute *attr,
 456                                              char *buf)
 457 {
 458         struct bonding *bond = to_bond(d);
 459         const struct bond_opt_value *val;
 460
 461         val = bond_opt_get_val(BOND_OPT_PRIMARY_RESELECT,
 462                                bond->params.primary_reselect);
 463
 464         return sysfs_emit(buf, "%s %d\n",
 465                           val->string, bond->params.primary_reselect);
 466 }
 467 static DEVICE_ATTR(primary_reselect, 0644,
 468                    bonding_show_primary_reselect, bonding_sysfs_store_option);
 469
 470 /* Show the use_carrier flag. */
 471 static ssize_t bonding_show_carrier(struct device *d,
 472                                     struct device_attribute *attr,
 473                                     char *buf)
 474 {
 475         struct bonding *bond = to_bond(d);
 476
 477         return sysfs_emit(buf, "%d\n", bond->params.use_carrier);
 478 }
 479 static DEVICE_ATTR(use_carrier, 0644,
 480                    bonding_show_carrier, bonding_sysfs_store_option);
 481
 482
 483 /* Show currently active_slave. */
 484 static ssize_t bonding_show_active_slave(struct device *d,
 485                                          struct device_attribute *attr,
 486                                          char *buf)
 487 {
 488         struct bonding *bond = to_bond(d);
 489         struct net_device *slave_dev;
 490         int count = 0;
 491
 492         rcu_read_lock();
 493         slave_dev = bond_option_active_slave_get_rcu(bond);
 494         if (slave_dev)
 495                 count = sysfs_emit(buf, "%s\n", slave_dev->name);
 496         rcu_read_unlock();
 497
 498         return count;
 499 }
 500 static DEVICE_ATTR(active_slave, 0644,
 501                    bonding_show_active_slave, bonding_sysfs_store_option);
 502
 503 /* Show link status of the bond interface. */
 504 static ssize_t bonding_show_mii_status(struct device *d,
 505                                        struct device_attribute *attr,
 506                                        char *buf)
 507 {
 508         struct bonding *bond = to_bond(d);
 509         bool active = netif_carrier_ok(bond->dev);
 510
 511         return sysfs_emit(buf, "%s\n", active ? "up" : "down");
 512 }
 513 static DEVICE_ATTR(mii_status, 0444, bonding_show_mii_status, NULL);
 514
 515 /* Show current 802.3ad aggregator ID. */
 516 static ssize_t bonding_show_ad_aggregator(struct device *d,
 517                                           struct device_attribute *attr,
 518                                           char *buf)
 519 {
 520         int count = 0;
 521         struct bonding *bond = to_bond(d);
 522
 523         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 524                 struct ad_info ad_info;
 525
 526                 count = sysfs_emit(buf, "%d\n",
 527                                    bond_3ad_get_active_agg_info(bond, &ad_info)
 528                                    ?  0 : ad_info.aggregator_id);
 529         }
 530
 531         return count;
 532 }
 533 static DEVICE_ATTR(ad_aggregator, 0444, bonding_show_ad_aggregator, NULL);
 534
 535
 536 /* Show number of active 802.3ad ports. */
 537 static ssize_t bonding_show_ad_num_ports(struct device *d,
 538                                          struct device_attribute *attr,
 539                                          char *buf)
 540 {
 541         int count = 0;
 542         struct bonding *bond = to_bond(d);
 543
 544         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 545                 struct ad_info ad_info;
 546
 547                 count = sysfs_emit(buf, "%d\n",
 548                                    bond_3ad_get_active_agg_info(bond, &ad_info)
 549                                    ?  0 : ad_info.ports);
 550         }
 551
 552         return count;
 553 }
 554 static DEVICE_ATTR(ad_num_ports, 0444, bonding_show_ad_num_ports, NULL);
 555
 556
 557 /* Show current 802.3ad actor key. */
 558 static ssize_t bonding_show_ad_actor_key(struct device *d,
 559                                          struct device_attribute *attr,
 560                                          char *buf)
 561 {
 562         int count = 0;
 563         struct bonding *bond = to_bond(d);
 564
 565         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
 566                 struct ad_info ad_info;
 567
 568                 count = sysfs_emit(buf, "%d\n",
 569                                    bond_3ad_get_active_agg_info(bond, &ad_info)
 570                                    ?  0 : ad_info.actor_key);
 571         }
 572
 573         return count;
 574 }
 575 static DEVICE_ATTR(ad_actor_key, 0444, bonding_show_ad_actor_key, NULL);
 576
 577
 578 /* Show current 802.3ad partner key. */
 579 static ssize_t bonding_show_ad_partner_key(struct device *d,
 580                                            struct device_attribute *attr,
 581                                            char *buf)
 582 {
 583         int count = 0;
 584         struct bonding *bond = to_bond(d);
 585
 586         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
 587                 struct ad_info ad_info;
 588
 589                 count = sysfs_emit(buf, "%d\n",
 590                                    bond_3ad_get_active_agg_info(bond, &ad_info)
 591                                    ?  0 : ad_info.partner_key);
 592         }
 593
 594         return count;
 595 }
 596 static DEVICE_ATTR(ad_partner_key, 0444, bonding_show_ad_partner_key, NULL);
 597
 598
 599 /* Show current 802.3ad partner mac. */
 600 static ssize_t bonding_show_ad_partner_mac(struct device *d,
 601                                            struct device_attribute *attr,
 602                                            char *buf)
 603 {
 604         int count = 0;
 605         struct bonding *bond = to_bond(d);
 606
 607         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
 608                 struct ad_info ad_info;
 609
 610                 if (!bond_3ad_get_active_agg_info(bond, &ad_info))
 611                         count = sysfs_emit(buf, "%pM\n", ad_info.partner_system);
 612         }
 613
 614         return count;
 615 }
 616 static DEVICE_ATTR(ad_partner_mac, 0444, bonding_show_ad_partner_mac, NULL);
 617
 618 /* Show the queue_ids of the slaves in the current bond. */
 619 static ssize_t bonding_show_queue_id(struct device *d,
 620                                      struct device_attribute *attr,
 621                                      char *buf)
 622 {
 623         struct bonding *bond = to_bond(d);
 624         struct list_head *iter;
 625         struct slave *slave;
 626         int res = 0;
 627
 628         rcu_read_lock();
 629
 630         bond_for_each_slave_rcu(bond, slave, iter) {
 631                 if (res > (PAGE_SIZE - IFNAMSIZ - 6)) {
 632                         /* not enough space for another interface_name:queue_id pair */
 633                         if ((PAGE_SIZE - res) > 10)
 634                                 res = PAGE_SIZE - 10;
 635                         res += sysfs_emit_at(buf, res, "++more++ ");
 636                         break;
 637                 }
 638                 res += sysfs_emit_at(buf, res, "%s:%d ",
 639                                      slave->dev->name,
 640                                      READ_ONCE(slave->queue_id));
 641         }
 642         if (res)
 643                 buf[res-1] = '\n'; /* eat the leftover space */
 644
 645         rcu_read_unlock();
 646
 647         return res;
 648 }
 649 static DEVICE_ATTR(queue_id, 0644, bonding_show_queue_id,
 650                    bonding_sysfs_store_option);
 651
 652
 653 /* Show the all_slaves_active flag. */
 654 static ssize_t bonding_show_slaves_active(struct device *d,
 655                                           struct device_attribute *attr,
 656                                           char *buf)
 657 {
 658         struct bonding *bond = to_bond(d);
 659
 660         return sysfs_emit(buf, "%d\n", bond->params.all_slaves_active);
 661 }
 662 static DEVICE_ATTR(all_slaves_active, 0644,
 663                    bonding_show_slaves_active, bonding_sysfs_store_option);
 664
 665 /* Show the number of IGMP membership reports to send on link failure */
 666 static ssize_t bonding_show_resend_igmp(struct device *d,
 667                                         struct device_attribute *attr,
 668                                         char *buf)
 669 {
 670         struct bonding *bond = to_bond(d);
 671
 672         return sysfs_emit(buf, "%d\n", bond->params.resend_igmp);
 673 }
 674 static DEVICE_ATTR(resend_igmp, 0644,
 675                    bonding_show_resend_igmp, bonding_sysfs_store_option);
 676
 677
 678 static ssize_t bonding_show_lp_interval(struct device *d,
 679                                         struct device_attribute *attr,
 680                                         char *buf)
 681 {
 682         struct bonding *bond = to_bond(d);
 683
 684         return sysfs_emit(buf, "%d\n", bond->params.lp_interval);
 685 }
 686 static DEVICE_ATTR(lp_interval, 0644,
 687                    bonding_show_lp_interval, bonding_sysfs_store_option);
 688
 689 static ssize_t bonding_show_tlb_dynamic_lb(struct device *d,
 690                                            struct device_attribute *attr,
 691                                            char *buf)
 692 {
 693         struct bonding *bond = to_bond(d);
 694
 695         return sysfs_emit(buf, "%d\n", bond->params.tlb_dynamic_lb);
 696 }
 697 static DEVICE_ATTR(tlb_dynamic_lb, 0644,
 698                    bonding_show_tlb_dynamic_lb, bonding_sysfs_store_option);
 699
 700 static ssize_t bonding_show_packets_per_slave(struct device *d,
 701                                               struct device_attribute *attr,
 702                                               char *buf)
 703 {
 704         struct bonding *bond = to_bond(d);
 705         unsigned int packets_per_slave = bond->params.packets_per_slave;
 706
 707         return sysfs_emit(buf, "%u\n", packets_per_slave);
 708 }
 709 static DEVICE_ATTR(packets_per_slave, 0644,
 710                    bonding_show_packets_per_slave, bonding_sysfs_store_option);
 711
 712 static ssize_t bonding_show_ad_actor_sys_prio(struct device *d,
 713                                               struct device_attribute *attr,
 714                                               char *buf)
 715 {
 716         struct bonding *bond = to_bond(d);
 717
 718         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
 719                 return sysfs_emit(buf, "%hu\n", bond->params.ad_actor_sys_prio);
 720
 721         return 0;
 722 }
 723 static DEVICE_ATTR(ad_actor_sys_prio, 0644,
 724                    bonding_show_ad_actor_sys_prio, bonding_sysfs_store_option);
 725
 726 static ssize_t bonding_show_ad_actor_system(struct device *d,
 727                                             struct device_attribute *attr,
 728                                             char *buf)
 729 {
 730         struct bonding *bond = to_bond(d);
 731
 732         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
 733                 return sysfs_emit(buf, "%pM\n", bond->params.ad_actor_system);
 734
 735         return 0;
 736 }
 737
 738 static DEVICE_ATTR(ad_actor_system, 0644,
 739                    bonding_show_ad_actor_system, bonding_sysfs_store_option);
 740
 741 static ssize_t bonding_show_ad_user_port_key(struct device *d,
 742                                              struct device_attribute *attr,
 743                                              char *buf)
 744 {
 745         struct bonding *bond = to_bond(d);
 746
 747         if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
 748                 return sysfs_emit(buf, "%hu\n", bond->params.ad_user_port_key);
 749
 750         return 0;
 751 }
 752 static DEVICE_ATTR(ad_user_port_key, 0644,
 753                    bonding_show_ad_user_port_key, bonding_sysfs_store_option);
 754
 755 static struct attribute *per_bond_attrs[] = {
 756         &dev_attr_slaves.attr,
 757         &dev_attr_mode.attr,
 758         &dev_attr_fail_over_mac.attr,
 759         &dev_attr_arp_validate.attr,
 760         &dev_attr_arp_all_targets.attr,
 761         &dev_attr_arp_interval.attr,
 762         &dev_attr_arp_ip_target.attr,
 763         &dev_attr_downdelay.attr,
 764         &dev_attr_updelay.attr,
 765         &dev_attr_peer_notif_delay.attr,
 766         &dev_attr_lacp_active.attr,
 767         &dev_attr_lacp_rate.attr,
 768         &dev_attr_ad_select.attr,
 769         &dev_attr_xmit_hash_policy.attr,
 770         &dev_attr_num_grat_arp.attr,
 771         &dev_attr_num_unsol_na.attr,
 772         &dev_attr_miimon.attr,
 773         &dev_attr_primary.attr,
 774         &dev_attr_primary_reselect.attr,
 775         &dev_attr_use_carrier.attr,
 776         &dev_attr_active_slave.attr,
 777         &dev_attr_mii_status.attr,
 778         &dev_attr_ad_aggregator.attr,
 779         &dev_attr_ad_num_ports.attr,
 780         &dev_attr_ad_actor_key.attr,
 781         &dev_attr_ad_partner_key.attr,
 782         &dev_attr_ad_partner_mac.attr,
 783         &dev_attr_queue_id.attr,
 784         &dev_attr_all_slaves_active.attr,
 785         &dev_attr_resend_igmp.attr,
 786         &dev_attr_min_links.attr,
 787         &dev_attr_lp_interval.attr,
 788         &dev_attr_packets_per_slave.attr,
 789         &dev_attr_tlb_dynamic_lb.attr,
 790         &dev_attr_ad_actor_sys_prio.attr,
 791         &dev_attr_ad_actor_system.attr,
 792         &dev_attr_ad_user_port_key.attr,
 793         &dev_attr_arp_missed_max.attr,
 794         NULL,
 795 };
 796
 797 static const struct attribute_group bonding_group = {
 798         .name = "bonding",
 799         .attrs = per_bond_attrs,
 800 };
 801
 802 /* Initialize sysfs.  This sets up the bonding_masters file in
 803  * /sys/class/net.
 804  */
 805 int __net_init bond_create_sysfs(struct bond_net *bn)
 806 {
 807         int ret;
 808
 809         bn->class_attr_bonding_masters = class_attr_bonding_masters;
 810         sysfs_attr_init(&bn->class_attr_bonding_masters.attr);
 811
 812         ret = netdev_class_create_file_ns(&bn->class_attr_bonding_masters,
 813                                           bn->net);
 814         /* Permit multiple loads of the module by ignoring failures to
 815          * create the bonding_masters sysfs file.  Bonding devices
 816          * created by second or subsequent loads of the module will
 817          * not be listed in, or controllable by, bonding_masters, but
 818          * will have the usual "bonding" sysfs directory.
 819          *
 820          * This is done to preserve backwards compatibility for
 821          * initscripts/sysconfig, which load bonding multiple times to
 822          * configure multiple bonding devices.
 823          */
 824         if (ret == -EEXIST) {
 825                 /* Is someone being kinky and naming a device bonding_master? */
 826                 if (netdev_name_in_use(bn->net,
 827                                        class_attr_bonding_masters.attr.name))
 828                         pr_err("network device named %s already exists in sysfs\n",
 829                                class_attr_bonding_masters.attr.name);
 830                 ret = 0;
 831         }
 832
 833         return ret;
 834
 835 }
 836
 837 /* Remove /sys/class/net/bonding_masters. */
 838 void __net_exit bond_destroy_sysfs(struct bond_net *bn)
 839 {
 840         netdev_class_remove_file_ns(&bn->class_attr_bonding_masters, bn->net);
 841 }
 842
 843 /* Initialize sysfs for each bond.  This sets up and registers
 844  * the 'bondctl' directory for each individual bond under /sys/class/net.
 845  */
 846 void bond_prepare_sysfs_group(struct bonding *bond)
 847 {
 848         bond->dev->sysfs_groups[0] = &bonding_group;
 849 }
 850